20608340021 has 8 divisors (see below), whose sum is σ = 20769315840. Its totient is φ = 20447546112.

The previous prime is 20608340017. The next prime is 20608340029. The reversal of 20608340021 is 12004380602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20608340021 - 2² = 20608340017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20608340029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186581 + ... + 275733.

It is an arithmetic number, because the mean of its divisors is an integer number (2596164480).

Almost surely, 2^20608340021 is an apocalyptic number.

It is an amenable number.

20608340021 is a deficient number, since it is larger than the sum of its proper divisors (160975819).

20608340021 is a wasteful number, since it uses less digits than its factorization.

20608340021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90955.

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 20608340021 in words is "twenty billion, six hundred eight million, three hundred forty thousand, twenty-one".